Dual power unit for duplex pump



Nov. 21, 1950 R. R. WATERMAN DUAL POWER UNIT FOR DUPLEX PUMPS 3 Sheets-Sheet 1 Filed July 2, 1946' INVENTOR .R.R. waierman ATTORN EYS Nov. 21, 1950 R. R- WATERMAN DUAL POWER UNIT FOR DUPLEX PUMPS 3 Sheets-Sheet 2 Filed July 2, 1946 INVENTOR R. R, Waterm ATTORNEYS mi. 21, 1950 R. R. WATERMAN 2,531,094

DUAL POWER UNIT FOR DUPLEX PUMPS Filed July 2, 1946 3 Sheets-Sheet 5 13 41 42 4] j] INVENTOR 45 RJQ. waiez'man BY mat ATTORNEYS iatented Nov. 2 1 195 UNITED STATES PATENT OFF ICE DUAL POWER UNIT FOR lfiUPLEX Russell R. Waterman, Lodi, Calif.

Application July 2, 1946-, Serial Nb; 681,000

Claims.

This invention is directed to, and it is an object to provide, an improved steam driven water pump of the duplex type.

Another object of the invention is to provide a crank unit in novel assembly with the twopower cylinders of the pump, whereby positive and correctly timed motion of the pistons of said power cylinders is accomplished. The operation of the pump is thus smooth and efiective, and the usual timing springs are eliminated in their ontirety.

A- further object of the invention is to provide a duplex pump which is practical, rugged, and yet simple in its construction; the pump being designed so that it requires a minimum of maintenance and repair.

These objects are accomplished by means of such structure and relative arrangement of parts as will fullyappear by aperusal of the following specification and claims.

In the drawings:

Fig. 1 is a longitudinal elevation of the pump, mainly in section.

Fig. 2 isa plan view, with the power cylinder unit in section.

Fig. 3 is-a cross section on line 3-3 of Fig. 2.

Fig. 4 is an end view of the crank, detached.

Fig. 51s a diagrammatic plan view oithe power cylinder unit, including the porting and conduit arrangement.

Referring now more particularly to the charactersof reference on the drawings, the improved duplex pump comprises a mainframe, indicated generally at l,-whichmain frame includes a bed 2', upstandingend heads 3 andv 4, and a. central vertical web 5 connecting the end heads 3 andl: above the bed 2.

The main frame I is supported, from below, by a: pedestal in the form of a hollow crankcase B, which crankcase includes adrain plug 1 adjacent the bottom thereof.

Adual pump unit, indicated generally at 8, is mounted in connection with and projects outwardly from the end head 3, while a dual-power cylinder unit, indicated generally at 9, is mounted in connection with and projects outwardlyfrom the end head 4;

The power cylinder unit 9 includes therein'a pair of cylinders It and H disposed in parallel sideby side relation and having pistons I2 and i3, respectively, mounted for reciprocation therein. The pistons. 12 and 13 are each connected to a pump rod; the pump rods being indicated at M. The pump rods extend through the end head A in packing glands i5, thence extend lengthwise over the bed 2, and pass through packing glands IS on the end head 3. Within the pump units the latter includes a pair of pumping assemblies,.one.of. which is shown in section in Fig. 1. Each pumping assembly includes. a double acting pump plunger ll connected to the corresponding pump red l4, and running in a: pump barrel I 8. Each pump assembly also ineludes anintake assage l9, intake valves 2B, outlet valves 2|, and an; outlet passage 22. The intake passages ['9 of the separate pump assembly are in communication, as are the outlet passages 22 of said assemblies, whereby the pump unit 3 includes. only a single intake port (not shown), and a single outlet port 23.

steam is sup lied to the dual power cylinders through bores 24- in the pump rods l4, said bores opening to the adjacent ends of said pump rods and having steam fed thereinto from a steam delivery manifold 25 on theouter end of the power cylinder unit 9;. said manifold being arranged so that thepump rods. mayreciprocat'e therein while having a constant supply of steam fed thereto. Steam is delivered to the manifold 25 through a fitting 26. The steam system of the dual power cylinder. unit 9 will hereinafter be described in detail, and for the present it suffices to note that thepistons i3 arefixedon the pump rods hi! to run with onepi'ston. exactly one-half stroke behind the other. piston; the stroke of both of said. pistons being relatively short- This relationship of the pistons to each other is positively and exactly maintained through. the medium of a crank unit which is constructed as follows:

A pair of transversely spaced, longitudinalguide rods 21!- are mountedi'n the crankcase 6 adjacent but short of. the top thereof and in parallel relation. to eachother, as well as to the pump rods 14. Eachguide rod 2-l is disposed in vertical alinement with the corresponding pump rod l4.

Reciproc able guide sleeves 28 are disposed on the rodszl, and each sleeve includes a depending guideway 29 in which a-vertically movable slide b1ock 30 is mounted. A crankshaft, indicated at 31,. is disposedtransversely in the crankcase 5- and issupported, at opposite ends, by bearingcaps 32 fixed in connection with opposite sidewalls of said crankcase. Thecrankshaft Si includesa-pair of cranks 33 disposed in vertical alinement withcorresponding guide rods 21, and said cranksflscarry theslide blocks 36. A counterbalancing: crank; 34. isincluded in the crankshaft3l between th-e' cranks 33. The cranks 33 are disposed, or rotate, apart.

Each guide rod 21 includes, centrally of its ends, an upstanding: boss 35' which extendsup wardlythrough an elongated; opening 35 formed in the bed 2 and surrounded byan upstanding fiangeiifl. Eachboss 35 projects abovethe corresponding flange; 3:1; and includes a bore 38 through. which the corresponding pump rod id extend-s. Each, boss 35 is fixed tothe corre sponding pump rod: lkby-aset screw 38. A protective cap -40 is carried on the-upper endof each boss 35 anddepends in clearance-butencompassingrelation to the adjacent flange 31, whereby to prevent access or. foreigmmatter through the elongatedopenings 36 tothe crankcase.

B'yx reason. or the. above: described crank unit the pistons I3 are positively and accurately maintained in proper timed relation to each other, and additionally the reversal of each piston at the end of its stroke, and at the beginning of the next stroke, is power assisted from the other piston which is then being steam actuated.

The steam system for the dual power cylinder 9 comprises the following:

Each piston I3 is double acting and formed with a pair of spaced apart, annular, steam feeding grooves il adjacent but short of the ends of such piston, and a relatively wide, annular, steam exhausting groove 42 centrally of said ends and between the grooves 4:. Each piston has a radial passage 43 opening between each stem feeding groove Q and the bore 24 in the corresponding rod i l.

The wall of each cylinder H is formed with a pair of ports 44 in longitudinally spaced apart relation; the spacing of ports 44 being lesser than that of the corresponding steam feeding grooves 4|.

Two pairs of steam ducts 45 are formed in the cylinder unit 9 and each pair connects between opposite ends of one cylinder 1 I and the opposite ports M of the other cylinder; each cylinder wall having a relatively wide exhaust port 46 therethrough centrally between the ports '44. An exhaust duct 4'! connects between the exhaust port 46 of one cylinder and a corresponding port 48 in the wall of the other cylinder; the latter having its exhaust port 36 open to atmosphere.

By reason of the above described porting and duct arrangement, it will be evident that each piston 83 controls the steam delivery to and exhaust from the other cylinder; each piston being under steam pressure at one end and exhausting at the other end only intermediate the ends of its stroke. At the end of each stroke and at the outset of the next and reverse stroke, each piston derives its movement from the other piston-which is then being steam driven intermediate the ends of a strokethrough the medium of the crank unit which connects the pump rods M. The crank unit thus serves to positively and accurately maintain the piston in time, and to reverse the motion of each piston at the end of each stroke, which assures of smooth, constant, and reliable operation. The 90 apart relationship of the cranks 33, and the relation thereof to the connected parts, positions each crank for a power application thereto when the corresponding piston I3 is steam driven.

A pocket 69 on the top of each slide block 30 traps oil from the case 6 and at the top of the stroke of said block the pocket forces the trapped oil through an opennig 50 in the corresponding sleeve 28 whereby to lubricate the latter. Excess oil escapes from the sleeve through outlet holes 5| in the sides of the sleeve.

From the foregoing description it will be readily seen that there has been produced such a device as substantially fulfills the objects of the invention, as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations therefrom may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described the invention, the following is claimed as new and useful, and upon which Letters Patent are desired:

1. In a motor which includes a pair of parallel fluid pressure operated pistons provided with piston rods; a-crankshaft J'ournaled at a right angle to and adjacent the piston rods, a pair of cranks fixed to the crankshaft, a lineal-rotary motion translating means connected between each piston rod and one of the cranks, such means comprising a guide rod fixed parallel with respect to the piston rod and disposed between such piston rod and the crank, a guide sleeve movable along the guide rod, means fixing the sleeve to the piston rod, a vertically disposed guideway fixed to the sleeve at right angles thereto, and a guide block journaledon the crank and being slidable in the guideway.

- '2. A motor as in claim 1 in which the means fixing the sleeve to the piston rod comprises a boss on the sleeve provided with an opening through which the piston rod extends, and a set screw mounted through the boss and engaging the piston rod.

3. In a motor comprising a main frame which includes a bed, a pair of parallel cylinders supported on the frame, fluid pressure operated pistons disposed in the cylinders and provided with piston rods disposed above the bed; a crank case formed with the frame below the bed, the bed being provided with an opening into said crank case adjacent each piston rod, a crank shaft vertically guided block journaled on the crank, and means mounting said block in connection with the piston rod, such means extending in part through said opening.

4. In a motor comprising a main frame which includes a bed, a pair of parallel cylinders supported on the frame, fluid pressure operated pistons disposed in the cylinders and provided with piston rods disposed above the bed; a crank case formed with the frame below the bed, the

bed being provided with an opening into said crankcase adjacent each piston rod, a crank shaft journaled in said crank case, a pair of cranks fixed to the crank shaft, a lineal-rotary motion translating means connected between each piston rod and one of the cranks, such means comprising a guide rod mounted within the case in parallelism with the piston rod, 2. guide sleeve movable along the guide rod, a vertically disposed guideway fixed to the sleeve at right angles thereto, a guide block journaled on the crank and slidable in the guide way, and a boss on the sleeve projecting upwardly through the adjacent opening in the bed and being connected with the piston rod.

5. A motor as in claim 4, including an upwardly extending flange formed about each opening, and a skirted cap fixed to each boss and overhanging the adjacent flange whereby to prevent access of foreign material through the openings.

RUSSELL R. WATERMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 95,222 Griscom Sept. 28, 1869 405,501 Picking et al June 18, 1889 448,356 Miller Mar. 17, 1891 710,769 Fox Oct. '7, 1902 1,754,743 Diserens Apr. 15, 1930 

